My Xfinity network does not show up on the list of connections. My phone and printer recognize my Xfinity network, but my laptop does not, it is using my old network. Can't print because of this.
The two WiFi bands have recently been combined into one with the Comcast gateway devices. Some devices get confused and don't know how to see / talk to combined bands.
Try this. No guarantees. If you are not using any Xfi Pods, you can try separating the 2.4 and the 5.0 bands and give them two different broadcast names / SSID's;
Associate the laptop with the 2.4 or the 5.0 (whichever one works) band's SSID (broadcast name) and password. YMMV. Good luck !